Language Intelligence
Language Mastered.
Kotoba is an AI-native language learning platform built for deep immersion — adaptive learning paths, real-time feedback, and a browser extension that captures vocabulary exactly where you encounter it.
The Philosophy
Context is Everything.
Traditional language apps teach vocabulary in isolation. Kotoba captures words in the context where you actually read them — on a news site, in a document, on any web page — and builds your learning path around your real digital life. AI adapts the difficulty, spacing, and review modality to your unique retention patterns.
- 1-Click Capture
- AI Context
- Spaced Repetition
- Immersion Mode
Core Capabilities
Built for Mastery, Not Streaks.
AI Immersion Engine
Provider-agnostic AI layer supporting OpenAI, Gemini, DeepSeek, and local models. Adaptive content generation, pronunciation feedback, and contextual translation — all personalised to your learning rhythm.
Browser Extension
Capture vocabulary anywhere on the web with a single click. Words are automatically enriched with context sentences, grammar analysis, and added to your personalised spaced-repetition deck — without leaving the page.
Offline-First PWA
Full offline functionality with background sync. Your learning deck, progress, and review sessions are always available — on commutes, on flights, or anywhere without connectivity. Cross-platform with native mobile performance.
Ready to master a language?
Join the early access programme and experience language learning engineered with the same precision we bring to every product we build.